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DIAGNOSIS 7A2-143
LINE PRESSURE TEST
Procedure 1. Chock the four wheels. 2. Remove the test plug of the transmission case and fit the oil pressure gauge. 3. Warm up the engine. 4. Apply the parking brake. 5. Step on the foot brake fully. 6.Set the select lever to either D, 3, 2, L or R range. 7. Record the oil pressure at idling. 8. When stepping over the accelerator pedal fully and the engine speed becomes constant, record the oil pressure quickly. Standard:
Engine Line Pressure (Kpa) Speed D, 3, 2 or L Range R Range Idling 350 - 480 450 - 650 Stall 1,050 - 1,250 1.400 - 1,630
Evaluation 1. If the line pressure is lower than standard value at idling in all ranges. • Abraded oil pump. • Faulty operation of each solenoid. • Sticking of pressure regulator valve or pilot valve. • Fatigued pressure regulator valve or pilot valve spring. • ATF leaking from oil strainer, oil pump, pressure regulator valve, torque converter relief valve or pressure relief valve. 2. If the line pressure is lower than standard value at idling in D, 3, 2 and L ranges. • ATF leaking from low clutch hydraulic circuit. 3. If the line pressure is lower than standard value at idling in R range. • ATF leaking from reverse hydraulic circuit. • ATF leaking from low and reverse brake hydraulic circuit.
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